Washboard Road:  
An 800 kg car carrying four 50 kg passengers 
travels a ``washboard road'' with bumps 2 m apart.  
The worst ``bumpiness'' occurs at a speed of 
 10 m/s.  
 of the loaded car on its spring suspension?
  
 of the loaded car on its spring suspension? 
(4 Edition) problems 
  93, 102, 105, 110, 119 and 125
Edition) problems 
  93, 102, 105, 110, 119 and 125